Nut-lock.



C. RYAN.

NUT LOOK. APPLICATION FILED JUNE 29, 1912.

1,0 1, 71 Patented May 13, 1913.

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. the threads 13 dee st threads 11' at .the end of bolt 10' i To allwhom it may detailed description CATHABINE RYAN, OF ST. PAUL, MINNESOTA.

NUT-LOCK. I

Specification of Letters Patent.

Application filed June 29, 1912. 'Serial No. 706,605.

concern: I

Be it known that I, CA'rHAmNn RYAN, a 'citizen of the United States,residing at St. Paul, in the county of Ramsey-and State of Minnesota,have invented certain new and useful Improvements in Nut-Locks, of whichthe followin is a specifi cation. My inventi relates to a nut lock andhas for its object to provide a bolt with a peculiar system of threadingin combination with a nut having a corresponding and cooperative systemof threadin such that when the nut is secured'upon t e bolt it will tendto move, if at all, in toward the-unthreade portion of the bolt.

The full objects and advantages of my invention will appear in}connection with the thereof and are particularly pointed out in theclaims.

In the drawings, illustrating the application of my invention in oneform, Figure 1 is a view of a bolt and Fig. 2 a sectional view of a nutembodying my invention. Fig). 3 is a modified form of a bolt adapted toe used with the nut shown.

As shown in Fig. 1, the bolt 10'is provided with a thread 11 which isdeepest at the free end of the bolt but gradually diminishes in depthtoward the unthreaded ortion of the bolt. The tops of the threads is ina cylindrical surface parallel with the side walls of the bolt orconcentric with the axis. of the bolt.

I The nut'12, as shown in Fig. 2, isprovided with an interior threadwhich beginning with the thread 13 at one side of the nut is about equalin depth to the threads on the bolt 10 adjacent the unthreaded portionof the bolt, said nut threads gradually increased in depth to a point 14at the other side of the nut where the threads will approximate in depththedeeper threads 11 on bolt 10. The bottoms of the threads of nut 12will lie in a common cylindrical'surface concentric with the centralaxis of the nut. When the nut 12 is ap lied tothe bolt 10 will be tplaced over the an the nut will 0" onto the bolt with comarativeease. Ys the. deeper. threads 14 of the nut 12 pass ontothe deepest threads 11of the bolt. they will d. 16 or bolt 15 that threads 16 constantly bindand wedge and hold the nut locked in position.

In Fig. 3 is shown a bolt 15 having from the end of the bolt to theunthreaded portion of the bolt, the bottoms of said threads falling in acylindrical surface 0011- centric with the axis of the bolt. In thiscase the tops of the threads do not extend in parallel lines. This boltis used with a nut 12 and has a" still more powerful locking effect. Inpractice the threads 14 will be so related in size to the largest ofthe'threads the nut can with difiiculty be driven over such largestthreads and will turn with increasing ease after passingsaidhighestthreads so as to tend constantly to turn toward the unthreadedportion of the Eolt and be held locked in position on the My nut andbolt canbe manufactured cheaply, and in use will prove very efiicientespecially for securing the tie-bars and of railroad rails in position."I. claim: 7

1. A' bolt comprising a threaded portion.

having the threads thereof constantly diminishing in depth 52. A bolthaving the threaded portion PatentedMay13,1913.]

from the end to the unthreaded portion, in combination with a thereofformed with a series of threads constantly diminishing in depth from theend of the threaded bolt to the unthreaded portion thereof. the bases ofsaidthreads falling in a cylindrical surface concentric with the axis ofthe bolt, in'combination with a nut having the threads thereofconstantly increasing in depth from the side of application of the nutto the bolt to the other side of the nut.

In -'testimony whereof I afiix my signature in the presence of two.witnesses.

'CATHARINE RYAN.

Witnesses F.- A. Wm'mmr,

H. A. Bowman.

